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Letters Patent No. 94,443, dated August 31, 1869,

, IMPROVE!) PAVERS RAMMER.

The Schedule referred to :in these Letters Patent and making part of the same.

To all whom tt ma/y concern:

Be it known that I, THOMAS ROBJOHN, of the city, county, and State of N ewYork, have' invented a new and improved PaversR-ammer, and `I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanyingdrawings, which form part of this specification, and in which'-.

Figure l represents a plan view of a pavers rammer constructed according to my invention;

(litigare 2 represents a rear elevation of the same; an

Figure 3, a vertical section, ltaken at right angles to Similar letters of reference indicate corresponding parts in the several ligures.

This invention has for its object the more uniform, rapid, and convenient ramming of stone pavements than is attainable with the ordinary handrammer; and to this end, Y

It consists in a lamming-apparatus of novel construction, whereby the desired end i's attained.

\ Referring to the accompanying drawings- A is a iectangular wooden frame, composed of timbers fitted together, and secured by means of tenons and mortises,or otherwise.

Said frame is provided at its rear end with a plat-` form, f, upon which the operator is designed to stand, not only for the convenience of the operator, but, also,

' for the purpose of steadying the machine while the same is iu operation.

It is also provided with and supported upon rollers, B B, for allowing llateral motion', said r'ollers being preferably so arraugedas to nearly or quite balance the machine, for the purpose `of reducing the friction caused by the contact of the two en ds thereof with the ground. i

In the front end of said frame A, and between fixed guides a, are iitted to slide one or more vertically-arranged lifting-mauls, or rammel-s or hammers, C C.

Said mauls or. rammersor hammers, being loaded, faced', or bound with iron, are susceptible ot' an upand-down motion, and are each provided with one or more rearward projections or studs, b, against which are made to act the radial or crossed lifting-arms, D, of a hcrizontal'shaft, E, in such manner, that by the backward turning ofthe said shaft, the mauls or rammers are caused to be lifted and allowed to drop alternately upon the stones that are designed to be rammed.

Said shaft E is driven bya cranked countershaft, F,

through a gearing-connection, g g, or any other suitable transmitting-medium.

The shaft E and countershaft F are or may be carried in a sliding frame, G, so that by the sliding of the frame nearer to or further from the mauls or rammers, the armsD are made to take more or'less hold under the said projecting studs b, thereby effecting a greater or less lifting of the mauls, as occasion may require, during the ramming-operation.

The sliding of said frame may be effected by means cfa lever, m, and connecting-nahm, so arrangedthat the operator may regulate the stroke of the rammers at pleasure, the .degree of projection of the upper ends of the rammers above the top of the frame, while the lower ends are resting on the stones below, serving to indicate to him the degree of force necessary to be applied, and, consequently, the degree of' elevation necessary to be given to the rammel'.

I is a horizontal supporting-bar, hinged to the frame, and provided with a lever or handle, h, so as, when upwardly turned, it will serve as a stop for'the rammers by meansof the contact of fixed studs d d, of the lat` ter, with the upturned edge of the former, during the descent of vthe, said remmers, this beipg for the purpose of supporting said mauls when, from anyreascn,

it is desirable that their lower ends shall not touch the round.

The platform f is or may be provided with a hinged leaf, f', so arranged as, when unfolded, to support the operator in a more convenient position for turning the crank, and which,.whe n not being used, may be folded back upon the'platform, so as to be out ofthe way.

The apparatus is or may be provided, also, with a novel stop-motion, consisting of upwardly-projecting supporting-tumblers, p p, restrained by pivoted locking-hooks, q q, and tripped or released .by means of tripping-rods r r.

The tumblers p p are hinged to the top of the frame A, and have a rearward inclination exerted upon them by means of springs s s, so as better'to insure rtheir engagement with suitabl y-arran ged notches o o, formed in the front side of the rammers, as 'shown in red outline in fig. 3. f

The tripping-rods 1r z are hinged or otherwise connected at their upper ends to the vlockingdiooks q q, and their lower ends fitted to slide through bearings at i, so that by their downward movement the said locking-hooks q q are withdrawn from their engage# ment with the tumblers p p, `thereby releasing the latter.

Spiral springs, w w, are coiled around the trippingscent of the said rammers, aser the stones under them` are sueiently rammed toallow the face of the rammer to stand level with the surface of the finished portion of the pavement which is being laid. 1

By this means the remmers are stopped in an up- Iii'ted position by the released tumblers, and are not permitted to descend or strike the stones after they have been driven or` rammed down even .with those upon which the machine is resting, even though the shaft may continue to turn.

' WhatI claim as'my invention, and desire to have secured by Letters'latent, is#- i 1. The adjustable or sliding frame G, in eombinaf tion with the frame A, the `lifting-arms D, and the rammers C, substantially as and for the purpose herein set forth.

' tio'ns dd of the rammers, sul'astantiallyv as and for the y purpose herein specified.v

' Y THOS. ROBJOHN.

Witnesses:

FRED. HAYNns,

VJ. W. CooMBs. 

